[FAB-4634] Update license headers

This patch updates license headers to SPDX format.

Change-Id: I77d944bdb9844e24732923b3f62d139988d2a289
Signed-off-by: Troy Ronda <troy.ronda@securekey.com>

.gitignore

@@ -1,3 +1,8 @@
+#
+# Copyright SecureKey Technologies Inc. All Rights Reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
 *.db
 *report.xml
 .DS_Store

fabric-client/events/consumer/consumer.go

@@ -1,19 +1,7 @@
 /*
 Copyright IBM Corp, SecureKey Technologies Inc. All Rights Reserved.
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-
-      http://www.apache.org/licenses/LICENSE-2.0
-
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
+SPDX-License-Identifier: Apache-2.0
 */
 
 package consumer